Simple Video Watermark Remover — v1.0 — v2.0

Use Simple Video Watermark Remover to remove a watermark from a video: provide a clip and a text prompt for SAM3 to locate the mark, and it produces a cleaned MP4 at the clip’s frame rate with the original audio.

Load Video accepts your clip, and its IN/OUT handles let you trim it; SAM3 Segment uses the prompt “watermark” at confidence 0.29 to build a mask on every frame.

Mask Refine grows the mask by 8 px and softens it; LaMa Inpaint fills it frame by frame, then Save Video writes the cleaned MP4 with the clip’s original frame rate and audio.

The input is a video clip, optionally trimmed with the IN/OUT handles; the output is a cleaned MP4 that retains the clip’s frame rate and audio.

Use an updated ComfyUI installation; install AusBoss nodes 2.2.0 or newer and ComfyUI-RMBG through ComfyUI-Manager, then restart ComfyUI.

Place big-lama.pt (206 MB) in ComfyUI/models/lama/ yourself; on first run, ComfyUI-RMBG downloads sam3.pt (3.45 GB) into ComfyUI/models/sam3/.

The named requirements are AusBoss nodes, ComfyUI-RMBG, and big-lama.pt; rgthree and Easy-Use are no longer needed.

Start with the prompt “watermark” at confidence 0.29; if the mark has a more specific description, use that in the detection prompt.

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If an outline remains, raise Expand on Mask Refine a little and add a bit more blur.

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LaMa fills each frame independently, so moving or busy backgrounds under the watermark can flicker, and some distortion may remain; review the output before running a long clip.